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Atom Investors LP

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$1.12B
Positions
818
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (31 quarters reported)

$1.54B $184M
Q4 18 Q3 20 Q2 22 Q1 24 Q4 25 Q2 26

$1.02B in Q4 2018 → $1.12B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
VI Vanguard Index Fds 4.1% Trimmed 0.1% 66,972 $46M
Viatris Inc 1.0% Added 561% 705,683 $11.2M
Intel Corp 0.9% Added 262% 76,015 $10.6M
HP Hewlett Packard Enterprise C 0.9% New 215,283 $9.71M
Rhythm Pharmaceuticals Inc 0.7% Added 29% 73,465 $8.16M
Esab Corporation 0.7% Added 238% 82,405 $8.13M
I Ishares Inc 0.7% New 234,771 $8.1M
Gxo Logistics Incorporated 0.7% Added 44% 156,873 $7.95M
AM Applied Matls Inc 0.6% Trimmed 50% 9,715 $7.02M
Broadcom Inc 0.6% Trimmed 51% 18,060 $6.82M
Nvidia Corporation 0.6% Trimmed 41% 33,901 $6.78M
Vse Corp 0.6% New 28,386 $6.49M
Apple Inc 0.6% New 21,814 $6.31M
Immunome Inc 0.6% Trimmed 3.1% 297,489 $6.3M
Jbt Marel Corporation 0.5% New 42,492 $6.16M
Verisign Inc 0.5% Added 308% 24,293 $6.11M
Equinix Inc 0.5% Trimmed 52% 5,714 $5.96M
IE Invesco Exchange Traded Fd T 0.5% New 27,764 $5.91M
Home Depot Inc 0.5% New 16,683 $5.88M
UP Ultragenyx Pharmaceutical In 0.5% Added 83% 171,771 $5.74M
Graco Inc 0.5% New 74,973 $5.67M
Ametek Inc 0.5% Added 62% 22,891 $5.54M
Microsoft Corp 0.5% Added 31% 14,579 $5.44M
Ttm Technologies Inc 0.5% Added 245% 28,908 $5.41M
Amazon Com Inc 0.5% Trimmed 54% 22,644 $5.4M
Alphabet Inc 0.5% Trimmed 0.8% 15,198 $5.37M
Zeta Global Holdings Corp 0.5% New 264,086 $5.2M
SH Silgan Hldgs Inc 0.4% New 107,324 $4.98M
Ferguson Enterprises Inc 0.4% New 20,966 $4.98M
Semtech Corp 0.4% Added 303% 30,064 $4.87M
Micron Technology Inc 0.4% New 4,068 $4.7M
Abbott Laboratories 0.4% Added 140% 50,174 $4.55M
LE Lincoln Elec Hldgs Inc 0.4% Added 4.7% 16,908 $4.49M
Lam Research Corp 0.4% New 9,535 $4.13M
Consolidated Edison Inc 0.4% Added 300% 35,657 $3.94M
Mcgrath Rentcorp 0.3% New 32,013 $3.87M
LC Lowes Cos Inc 0.3% New 17,565 $3.87M
Mastercard Incorporated 0.3% New 7,408 $3.8M
NP National Presto Inds Inc 0.3% Added 6.6% 30,383 $3.8M
Hni Corp 0.3% Added 42% 93,877 $3.79M
Reliance Inc 0.3% Trimmed 66% 10,023 $3.74M
Supernus Pharmaceuticals 0.3% Added 75% 79,936 $3.72M
Gilead Sciences Inc 0.3% New 29,028 $3.67M
Dianthus Therapeutics Inc 0.3% Trimmed 65% 37,228 $3.63M
Core & Main Inc 0.3% Added 941% 74,801 $3.61M
Celcuity Inc 0.3% Trimmed 55% 34,488 $3.61M
Pepsico Inc 0.3% New 26,345 $3.57M
Syndax Pharmaceuticals Inc 0.3% Added 4.2% 162,524 $3.55M
Nrg Energy Inc 0.3% Trimmed 48% 24,183 $3.53M
Malibu Boats Inc 0.3% Trimmed 45% 127,366 $3.49M
Fastenal Co 0.3% New 72,660 $3.49M
EM Eagle Matls Inc 0.3% New 15,501 $3.49M
Axsome Therapeutics Inc. 0.3% Added 73% 14,179 $3.47M
CF Cvb Finl Corp 0.3% Trimmed 14% 153,349 $3.46M
BH Bluelinx Hldgs Inc 0.3% Trimmed 5.9% 54,846 $3.39M
Fedex Corp 0.3% New 10,714 $3.35M
Starbucks Corp 0.3% New 32,753 $3.35M
BS Bentley Sys Inc 0.3% Added 39% 111,872 $3.34M
Innospec Inc 0.3% Added 0.2% 40,870 $3.33M
Amentum Holdings Inc 0.3% Added 605% 160,876 $3.33M

Showing top 60 of 818 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

Company Action Shares changed Value of change % of portfolio
Bio-techne Corp Exited −319,316 −$16.7M —
Scotts Miracle-gro Co Exited −173,347 −$10.5M —
HP Hewlett Packard Enterprise C New +215,283 +$9.71M 0.9%
Viatris Inc Added +598,911 +$9.51M 1.0%
CC Carlisle Cos Inc Trimmed −26,095 −$9.47M 0.1%
Insight Enterprises Inc Trimmed −72,516 −$8.83M 0.1%
Wex Inc Exited −56,949 −$8.72M —
BH Block H & R Inc Exited −273,466 −$8.68M —
Builders Firstsource Inc Trimmed −95,443 −$8.54M 0.1%
Alaska Air Group Inc Exited −229,238 −$8.43M —

Showing the 10 largest of 1056 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
Liberty Energy Inc Trimmed −490,901 −$14.1M —
Siteone Landscape Supply Inc Trimmed −105,700 −$14.1M 0.2%
Salesforce Inc Exited −52,870 −$14M —
Golar Lng Ltd Trimmed −251,139 −$13.6M 0.1%
Equinix Inc New +11,954 +$11.7M 0.8%
SS Select Sector SPDR Tr Exited −266,557 −$11.4M —
SS Select Sector SPDR Tr Exited −143,951 −$11.2M —
IT Ishares Tr Exited −118,443 −$11.2M —
SS Select Sector SPDR Tr Exited −71,941 −$11.1M —
Astronics Corp Exited −188,492 −$10.2M —

Showing the 10 largest of 880 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr Exited −404,557 −$97.9M —
SS SPDR S&P 500 ETF Tr Trimmed −99,546 −$67.9M 0.1%
VI Vanguard Index Fds New +67,041 +$42M 3.3%
IT Ishares Tr Trimmed −223,908 −$40.6M 0.1%
Bio-techne Corp New +351,673 +$20.7M 1.6%
SS SPDR Series Trust Trimmed −232,391 −$19.8M —
SS Select Sector SPDR Tr Trimmed −328,203 −$18M —
IQ Invesco Qqq Tr Exited −26,313 −$15.8M —
Siteone Landscape Supply Added +118,924 +$14.8M 1.2%
SS SPDR Series Trust Trimmed −119,886 −$14.6M —

Showing the 10 largest of 844 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

Company Action Shares changed Value of change % of portfolio
SS SPDR S&P 500 ETF Tr Added +87,731 +$58.4M 5.1%
IT Ishares Tr Added +89,729 +$21.7M 7.4%
IQ Invesco Qqq Tr New +26,313 +$15.8M 1.2%
SS Select Sector SPDR Tr Trimmed −212,128 −$11.4M 1.4%
Viper Energy Inc New +267,132 +$10.2M 0.8%
Middleby Corp New +73,378 +$9.75M 0.7%
The Cigna Group Added +33,207 +$9.57M 0.8%
AW American Wtr Wks Co Inc New Trimmed −68,568 −$9.54M 0.1%
SC Southstate Corporation Exited −101,298 −$9.32M —
Azz Inc New +84,282 +$9.2M 0.7%

Showing the 10 largest of 857 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr Added +301,769 +$65.1M 6.0%
SS SPDR Series Trust Added +160,469 +$12.4M 1.5%
Idex Corp Trimmed −65,484 −$11.5M 0.1%
GW Grainger W W Inc Exited −11,577 −$11.4M —
IE Invesco Exchange Traded Fd T New +60,792 +$11M 1.0%
SS Select Sector SPDR Tr Added +74,861 +$10.1M 1.4%
SS Select Sector SPDR Tr Added +189,402 +$9.92M 2.5%
SS SPDR Series Trust Added +96,736 +$9.54M 1.6%
RI Rpm Intl Inc Exited −80,994 −$9.37M —
CN Chevron Corp New New +63,454 +$9.09M 0.8%

Showing the 10 largest of 796 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr Trimmed −164,912 −$32.9M 0.3%
IT Ishares Tr Added +103,056 +$15.6M 4.5%
SS Select Sector SPDR Tr Added +291,854 +$14.5M 2.2%
GW Grainger W W Inc New +11,577 +$11.4M 1.4%
IT Ishares Tr New +108,214 +$10.1M 1.2%
Osi Systems Inc New +38,279 +$7.44M 0.9%
Fair Isaac Corp New +3,844 +$7.09M 0.9%
AR Agree Rlty Corp Trimmed −91,118 −$7.03M 0.1%
Brunswick Corp Added +129,969 +$7M 1.5%
Rockwell Automation Inc New +26,111 +$6.75M 0.8%

Showing the 10 largest of 653 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 14, 2025

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr Added +173,413 +$38.3M 4.9%
Microsoft Corp Trimmed −27,817 −$11.7M 0.4%
Unitedhealth Group Inc Trimmed −20,706 −$10.5M 0.1%
Visa Inc Trimmed −31,943 −$10.1M 0.5%
AC Axalta Coating Sys Ltd Trimmed −267,607 −$9.16M 0.5%
VI Vanguard Intl Equity Index F Exited −120,586 −$8.57M —
Amazon Com Inc Trimmed −38,439 −$8.43M 0.3%
Keurig Dr Pepper Inc Exited −222,186 −$8.33M —
Sherwin Williams Co Exited −21,638 −$8.26M —
RF Regions Financial Corp New New +339,053 +$7.97M 1.0%

Showing the 10 largest of 662 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 14, 2024

Company Action Shares changed Value of change % of portfolio
Unitedhealth Group Inc Added +21,259 +$12.4M 1.3%
RC Regency Ctrs Corp Exited −184,567 −$11.5M —
AT American Tower Corp New Trimmed −46,117 −$10.7M 0.4%
CO Capital One Finl Corp New +70,545 +$10.6M 1.1%
TS Taiwan Semiconductor Mfg Ltd Trimmed −58,346 −$10.1M 0.3%
AC Axalta Coating Sys Ltd Added +253,142 +$9.16M 1.4%
M& M & T Bk Corp New +51,374 +$9.15M 1.0%
American Homes 4 Rent Exited −243,778 −$9.06M —
Microsoft Corp Added +20,100 +$8.65M 1.6%
Keurig Dr Pepper Inc New +222,186 +$8.33M 0.9%

Showing the 10 largest of 643 changes.

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